public void add(SomeObject someObject) {
    if (someObject == null) {
       throw new IllegalArgumentException();
    }

    try {
         Session session = sessionFactory.openSession();
         
         Transaction transaction = null;

         try {
             transaction = session.beginTransaction();
             session.save(someObject);
             transaction.commit();
         } catch(Exception e) {
              if (transaction != null) { transaction.rollback(); }
              throw e;
         } finally {
              session.close();
         }
    } catch(Exception e) {
         throw new RuntimeException("Ошибка при добавлении ...");      
    }
}

throw new RuntimeException("Ошибка добавления ... ", e);

abstract class DAO<T, ID> {
     public abstract void add(T t);
     public abstract void update(T t);
     public abstract void delete(T t);
     public abstract List<T> getAll();
     public abstract T getById(ID id); 

     protected abstract String getAddErrorMessage();
     protected abstract String getUpdateErrorMessage();
     protected abstract String getDeleteErrorMessage();
     protected abstract String getGetAllErrorMessage();
     protected abstract String getGetByIdErrorMessage();
}